Daedalus - maybe you're seeing something related to:
https://bugs.launchpad.net/ubuntu/+source/unity/+bug/661450
I was having similar problems getting external monitors to work on a
laptop, switching to ubuntu classic fixed it for now.
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Automatic updates popped up this morning (including a gnome-screensaver
update), after installing and restarting the problem has gone away for
me.
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unlock screen -dialog comes up twice
https://bugs.launchpad.net/bugs/556255
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